It’s 10 p.m. on Tax Day and Tiffany Rodriguez, who works at a Manhattan accounting firm, is blowing off steam on a lighted stage in Midtown.

Wearing conservative glasses and slacks, her hair pulled back in a sensible ponytail, she’s belting out Cher’s “Believe” while four backup dancers in glitter makeup gyrate behind her.

Rodriguez, 29, has paid $20 to sing in front of a crowd while strangers dance around her.

“Yes, it is expensive,” says Rodriguez, from Sunnyside, Queens.

“I usually pay a dollar.”

Welcome to Jelsomino, a new Russian karaoke bar aiming to attract big spenders who want to sing like they’re on “Solid Gold.” For $20 a tune, customers warble on a circular stage, where they’re joined by up to half a dozen professional backup singers, accordion players and violinists. There’s even an in-house player of the balalaika — a three-stringed instrument popular in Russia.

“The idea of Jelsomino is that people who come in have to feel like they’re superstars,” says 32-year-old co-owner Tatiana Brunetti, who opened the space Tuesday. “We take care of the rest.”

Hidden behind a red leather door, the subterranean space on West 55th Street houses a 75-person performance area where the magic happens.

Here, bottle service is required for patrons who want some liquid courage before taking the stage to sing one of the 60,000 songs on the list, many of which are in Russian and subtitled in Cyrillic. So far, vodka is the big seller, with the cheapest being Belvedere at $350, and Beluga Gold fetching $1,200 at the high end. Each table is equipped with an iPad, which holds the extensive song catalog.

This is where 53-year-old Ilya Bykov sits while perusing a bar menu and awaiting five guests.

“Sometimes, you don’t necessarily want to be entertained — you want to entertain yourself,” says the Moscow-born Chelsea transplant. Unsure whether he’ll sing, Bykov says that if he does, he’ll probably utilize the staff’s talents. “I don’t have much of a voice, so I’ll take all the help I can get,” he says.

Around Bykov, international stunners who look like Bond girls and moneyed multilingual types wander through the dark space, following the waitresses’ glow-in-the-dark cocktail trays.

In the backroom lounge known as Backstage, customers camp out on directors’ chairs emblazoned with late rock-star names such as Morrison, Moon and Cobain. As they do, they sip cocktails such as the $65 Beluga Caviar Martini and the $145 Remy Martin Louis XIII au Chocolat, made with aged port.

Beyond this point is a private 10-person VIP area called the Recording Studio, reserved for big-shot karaoke lovers who don’t want their shame broadcast on YouTube. No actual recording takes place in the Recording Studio, which rents for $3,000 to $20,000 per night, depending on catering and cocktail packages. In the coming weeks, an adjoining restaurant called Courgette will open upstairs.

According to Brunetti, 5,000 singers applied to work as backup performers. After a year of auditions, she hired a dozen of them, half of whom work on any given night.

One of those hires waiting for tonight’s show is 28-year-old crooner Kecia Craig.

“I’m your Aretha Franklin,” says Craig, who drove two hours from Poughkeepsie for her two auditions before being hired three months ago. “I’m the girl with the big voice.”

Should customers request a Freddie Mercury type, they’ll find themselves accompanied by 21-year-old singer Brady Cudmore, who auditioned four times before landing this gig. Cudmore says having backup singers gives newbies confidence. “It’s really an interactive group effort,” he explains.

Though Brunetti grew up in Ukraine, she says Jelsomino in New York feels like home. “When I was 14, I had posters of Michael Jackson, Mick Jagger and Aerosmith,” says Brunetti, who launched Jelsomino in St. Petersburg, Russia, in 2005 and Moscow one year later before moving to NYC in 2007. Next month, she’ll open another franchise in Miami. “Our target is to be international. Our philosophy is no matter where you’re from, you want to be a superstar here.”

On Tuesday night, the NYC Jelsomino was already sold out — a good portion of the clientele was from the former Soviet Union. “Russians have a big heart,” says Brunetti. Big wallets, too. “When you read in an article someone came here and spent $120,000,” she admits, “it’ll probably be a Russian.”